Robertshaw RS4220C User Manual page 8

CY = Cycle Timer allows a compressor to rest between cycles. Can be
set from 0 to 5 minutes in 1 min increments.
WARNING: A wrong short cycle setting can
damage your equipment. This should only be
changed by a trained HVAC professional.
CL = Calibration offset. Changes the displayed temperature from the
actual temperature by +3 to -3 degrees in one degree increments.
Increasing the offset by +2 will cause the thermostat to display a
temperature that is 2 degrees higher than the actual room.
Creating a Password – Protect the Settings
The buttons on the front of the thermostat can be locked with a password.
To create a password:
1. Press the
for 5 seconds.
You will be asked for a 2 digit password.
2. The digits are set using the
through 00 to 99.
Press the
3. The password is saved after 5 seconds.
All of the front buttons are now locked out until the password is entered.
Pressing any button will cause
To unlock the buttons:
1. Push and hold the
request for password is displayed.
2. Enter the digits for the password by pressing
progress through the numbers to the password.
3. When the correct password is set, wait for 5 seconds to unlock the
system.
4. If the wrong password is entered the display will flash -- for 5
seconds then return to normal.
Once the security has been disabled, a password needs to be
re-created to protect the settings.
and buttons at the same time and hold them in
to move to the next digit. Press
to flash.
and
and buttons to progress
buttons for 5 seconds until the
8
to move back.
or to